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Rick Scott, Governor
Florida Department of Corrections, Secretary Michael D. Crews

Florida Department of Corrections
Michael D. Crews, Secretary

Experimental and Control Group Selection

As mentioned above, previous studies have limited the method of identifying public versus private inmates to only those released directly from one of the two types of facilities, regardless of the length of time spent in either or both types (Lanza-Kaduce, et al., 1999) and to those released directly from each facility type after spending at least six months at that facility (Farabee and Knight, 2002).

The current research essentially replicates the experimental measures used in these studies and builds four additional measures to quantify the level of exposure to public and private prisons. Comparisons in recidivism rates between public and private inmates, as defined in the six measures, were conducted for this research. This resulted in defining and quantifying six different measures and, therefore, six different groups of pubic and private inmates as detailed in Table 1. Similar results across the six experimental measures should increase confidence in results from this analysis. Different results across the six measures will depend solely on the treatment group definitions, which may shed light on why public or private prisons result in lower recidivism rates.

Table 1: Experimental and Control Group Definitions
Analysis Group Treatment Group Definition Control Group Definition Excluded Cases
A1 Released directly from a private C.I. (Lanza-Kaduce, et al., 1999) Released directly from a public C.I. Excludes inmates released from Work Release Centers, Road Prisons, Contract Drug Facilities, Boot Camps, and Work/ForestryCamps.
A2 Released directly from a private C.I. and served at least 6 months in private C.I. (Farabee-Knight, 2002 study for CPC) Released directly from a public C.I. and served at least 6 months in public C.I. Excludes inmates released from WRCs, Road Prisons, Contract Drug Facilities, Boot Camps, Work/Forestry Camps, those with very short periods of incarceration, and those that spent their time in facilities other than C.I.s.
B1 Served only in reception center, private C.I., and/or work release center. No time spent in public facilities, except reception and possibly work release center. Served only in reception center, public C.I./Work/Forestry Camp/Road Prison, and/or work release center. No time spent in private C.I. Excludes inmates that spent time in both public and private facilities.
B2 Served only in reception center, private C.I., and/or work release center, or served at least 75% of time in private C.I Served only in reception center, public C.I./Work/Forestry Camp/Road Prison, and/or work release center, or served at least 75% of time in public C.I./Work/Forestry Camp/Road Prison. Excludes inmates that spent some time in both private and public facilities, but less than 75% of their time in either specific type of facility.
B3 Served only in reception center, private C.I., and/or work release center, or at least 12 months at private C.I. and less than 12 months at public C.I. Served only in reception center, public C.I., and/or work release center, or at least 12 months at public C.I. and less than 12 months at private C.I. Excludes inmates with time in both private and public C.I. if time spent in either is less than 12 months (i.e., excludes mixed cases with short periods of incarceration).
C1 At least 12 months in private C.I. or at least 75% of time in private C.I. Less than 12 months and less than 75% of time in private C.I. No inmates excluded.